Forces: Momentum Flashcards
1
Q
What is the formula for momentum?
A
mass x velocity = momentum
2
Q
Is momentum a vector or a scalar? What does this mean?
A
Vector
It has both direction and magnitude.
3
Q
What is the conservation of momentum?
A
In a closed system, the total momentum before a collision is the same as the total momentum after.
4
Q
What are the two formulae to calculate the force used to change an object’s velocity?
A
change in momentum
——————————- = force
time
(mv -mu)
———— = F
t
5
Q
How do safety features on a car work in terms of momentum?
A
They increase the time taken for momentum to be loss therefore lowering the force acting on the person inside.
6
Q
Does the momentum of an object change if it changes direction?
A
Yes as it’s direction is changing and momentum is a vector.
